Clamshell bucket



Sept. 10, 1929. E. L HARRINGRON {7274825 CLAM SHELL BUCKET 'Filed 001;. 29. 1926 INVENTOR.

712 xld/ A TTORNEYS.

Fetented fiept. MI 19 29.

UNETEEIE QFFEQEQ EDWARD L. HARRINGTON, OF ERIE, PENNSYLVANIA, ASSIGITOB TO I-I. .VILLIAIIES COMPANY, OF ERIE, PENllgYLvfiNlA, A GORPDRATEON (2F PEFATNSYLVANIA.

OLAMSI-IELL BUCKET.

Application filed October 29, 1955 Single-line buckets have heretofore been constructed which involve the control of the bucket through a pull line and this necessitates the attention ordinarily of an extra man not only incurring the extra expense but in many situations it is inconvenient.

The present invention is designed to provide means on such a bucket by which it may be actuated through the operation of the operlo ating line. Features and details of the invention will appear from the specification and claims.

The invention is illustrated in the accompanying drawings as follows Fig. 1 is a vertical section on the line 1-1 in Fig. 2.

Fi 2 a side elevation of the bucket.

Fig. 3 a section similar to Fig. 1 with the bucket open.

11 mark the bucket members. These are provided with the arms 2 and 2. These arms are pivotally mounted on pin 3 permitting the bucket members to swing open and closed with a pivotal movement around the 25 pin. Links 4 extend upwardly from the corners of the members 1 to the usual head 5.

A power arm 6 is pivotally connected on a rod 7, the rod 7 being carried by brackets 8 on the bucket members, the rod 7 being also utilized a securing means for the links 1-. The arm 2 is provided with a latch shoulder 9 and a latch. 11 is pivotally mounted on a pin 12 between the sides of the power arm 6. The latch has a hook 13 engaging the latch shoulder 9. A trip dog 1 1 is pivotally mounted on a pin 15 extending between the sides of the arm 6. It is provided with a roller 16 at its outer end operating on an engaging surface 17 on the under-side of thelatch. A lever 18 extends from the trip dog and a trip line 19 is secured to the end of the lever being carried over a pulley block 20, the pulley block 45 being suspended from a bracket 21 on the head 5. The trip dog has a releasing arm :2 which is arranged in a roller 23, at its lower end, and this engages a cam 24 carried by the arm 2 so that as the auxiliary power arm 6 lowered the trip swung from Serial No. 14%,959.

locking position so as to permit the latch 11 to swing, thus permitting the hook 13 to pass the shoulder 9 and engage the same.

Tmmediatelyupon the return movement the latch dog swings into locking position and locks the latch in position until tripped. The surface 17 is slightly off radially with the axis 12 as a center so that the pressure of the latch tends to hold the trip dog against release. The engaging surfaces of the shoulder 9 and hook 13 are slightly off theradial so that the pressure on the hook tends to open the latch. The lifting lines 25 are in pairs carried by a head 26. They are carried around sheaves 27 arranged in brackets 28 extending from the auxiliary power arm and then around sheaves 29 at the ends of the auxiliary power arm, then around sheaves 30 in the head, around sheaves 31 in the auxiliary power arm, around sheaves 32 in the auxiliary power arm and to the clamp 33 at the pivotal end of the arm 2. These parts so far as described are of common construction.

In the operation of the bucket, the tripping of the latch permits the unlocking of the hook from the position shown in Fig. 1 and the weight of the material in the bucket opens the bucket discharging the same. This tripping is accomplished by the pull on the cord 19. The bucket is then lowered to the work and the auxiliary power arm is lowered to position, the hook engaging the hook surface and on the lifting operation the trip dog swings in back of the latch preventing an unlatching of the parts until again tripped by the trip rope. As before stated, the present invention is designed to permit of the unlatching of the hook 13 through the operation of the lifting line. In carrying out my invention I arrange a spring 34 on the arm 18 and a spring 35 on the head 5, the springs being so arranged that as the bucket is closed and the auxiliary power arm, is lifted toward the head the springs 34 and 35 are brought into engagement, the contact point of the springs with relation to the pivot of the trip dog and arm 18 beingsuch as to yieldingly press the trip dog is direction to releasetlie same from the latch. The pressure of the spring, however, is not sufficient to afi'ect a movement of the trip dog so long as the latch is subjected to the load strain of the bucket by reason of the out-of-radial direction of the surface 17, which tends to lock the trip dog against a release movement.

In the operation of the device with this releasing mechanism in place the bucket is dropped to the vwork in the usual manner and the auxiliary power arm lowered so as p to engage the hook 13. The lifting on the hoisting line closes the bucket with the usual operation of leverage asin buckets heretofore. As the bucket is closed the springs are brought into engagement but, as before stated, the latch is not tripped due to the engagement of the surface 17 with its out of radial formation on the trip dog. The

bucket is then carried to the place of deposit and the bucket lowered to the ground so as to relieve the hoisting line of the bucket load. Immediately this is done the pressure ofthe springs operating on the trip dog moves the trip dog to released position, thus permitting the swinging of the latch to released position and upon the lifting of the bucket through the action of the hoisting line the bucketis permitted to open, thus discharging its contents and the operation can then be repeated.

What I claim as new is 1. In a device of the classdescribed, the combination of a pair of pivotally connected bucket members; a head; links connecting the head with the bucket members at points remote from the pivot; an auxiliary power arm; a latch between the power arm and l the bucket members; an operating connecthe bucket members;

tion between the bucket members and the head; and yielding trip device for, the latch permitting the latch to remain closed unc er load and tripping the latch as it is relieved of load.

2. In a device of the class described, the combination of bucket members having arms extending therefrom and pivotally connected together; a head; links extending from the head to the bucket members at points remote from the pivot; an auxiliary power arm pivotally mounted on one of a latch mounted on the power armg'a hook connection between the latch and one arm of the bucket member, said latch connection tending under load to disengage; a trip dog on the auxiliary power arm operating on the latch, the

engaging surfaces of the trip dogand latch tending to lock the trip dog against disengagement under pressure of the latch; a yielding connection between the trip dog and the head, said connection being brought into engagement with the closing of the bucket and throwing the trip dog upon a release of load pressure; and a cable connection extending between the head and the auxiliary power arm.

8. In a device of the class described, the combination of a pair of pivotally connected bucket members; a head; links connecting the head with the bucket members at points remote from the pivot; an auxiliary power arm; a latch bet-ween the power arm and the bucket members; an operating connection between the bucket members and the head; and a yielding trip device comprising a spring exerting tripping pressure on the latch, the spring being of insufficient strength to trip the latch under load and tripping the latch as it is relieved of load.

In testimony whereof I have hereunto set my hand.

EDXVARD L. HARRINGTON. 

